So, for those of you who suck at platformers and don't enjoy them at all, here's what is essentially a complete save with all abilities unlocked.
For those of you who do enjoy platformers, here's a tip you'll appreciate. By the time you finish the game, you may notice that there's a very tall room that looks like you should be able to go up to, but there are two vertical strips of damaging energy-field-thingy that shows up and disappears periodically, and also stuns you upon contact.
Here's how you get to the top of this area:
Make sure you have the following abilities: high jump, double jump x 2, wall jump, sword with x 2 on uppercut move, hammer with x 2 on uppercut move.
Initially, put a keep there so you can afford to try multiple times. You'll need to give it a few shots before you can time your jump well.
Start with the high jump, and keep going up using your double jumps, but stick close to the left side. As soon as the left wall clears, get to it and do a wall jump. When you reach the peak of that jump, Do a sword uppercut move towards the right wall, and as soon as that reaches peak, turn around and do a hammer uppercut move to the left.
If you did all of the above correctly, You'll have reached high enough to notice that there's a ledge you can stand on protruding on the left wall. Rest is up to practice and precise aiming of your jumps.
Why even bother go there? Because after stepping through few more easy wall jumps, your reward is a move skill called Wing, which allows you to fly indefinitely in any direction.